Question

walls of trachea does not collapse even when there is less or no air in it

Answer 1

walls of trachea contains incomplete C shaped cartilaginous rings ..... hence....

Answer 2

Heya mate✋✋
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Here is your answer:--->
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Walls of trachea does not collapse even when there is little or no air in it as the cartilage rings are present on its surface which support it.

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Hope it helps✌✌

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Thanks.